Homopolymers and copolymers of vinyl chloride having low vinyl chloride monomer content, and method of making same
CA 1112391 A · Owner: Tenneco Chemicals, Inc. · Inventors: Owens, Fred V.; Fila, Barbara; Saggese, Michael F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Michael Frank Saggese, Fred V. Owens and Barbara Fila, citizens of the United States of America residing at, Nashville, Tennessee, Trenton New Jersey, and Edison, New Jersey; respectively. ABSTRACT OF THE DISCLOSURE Dry particulate vinyl chloride homopolymers and copolymers and dry particulate compostions containing major proportions of these polymers, having 2 parts or less per million of vinyl chloride monomer are provided. The viny chloride monomer can be so low as to be undetecable. The reduction in monomer content is achieved by subjecting the dry polymer particles to elevated temperature agitation, and subatmo-, spheric pressure.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 10, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.